CN103797324A - Device for transferring a metallurgical material - Google Patents

Abstract

The invention relates to a device having a bottom, side walls and a ceiling, which together define a channel, as well as transportation means, extending in an axial direction of said channel from an entry port of the channel to an exit port of said channel, for transferring a metallurgical material from said entry port to said exit port.

Description

For transmitting the device of metallurgical material

The present invention relates to a kind of device, it has bottom, sidewall and top (top board, and transfer member (transportation means ceiling), conveying device), described bottom, sidewall limit passage together with top, described transfer member extends to the outlet port of described passage on the axial direction of described passage from the ingress port of this passage, for metallurgical material is transferred to described outlet port from described ingress port.

Such device can be from US5, and 400,358A is known, and such device is feeded and preheated major metal for preheating chamber in (the similar tunnel) of corresponding channel-like.This passage has ingress port (also referred to as transitional region), and on the throughput direction of metal charge, be followed by the so-called thermal treatment zone and unloading part, described unloading part defines the outlet port of described passage, and preheated metal charge from this outlet port directly or be supplied to via middle installation portion the metallurgy melting container of similar electric arc furnaces.

Term " metal charge " is characterized as the similar pig iron, iron-bearing materials, HBI(hot-pressed iron compact), DRI(DRI), the metallurgical material of waste material etc., be below commonly referred to waste material (scrap).

The general design of described device described in term " channel-like or tunnel ", but be not limited to any concrete elongation, size, structure etc.

The axial direction of described device corresponding to when waste material typically by described device and when then directly or indirectly (for example,, via middle collecting bin (collecting bin)) is supplied in associated metallurgical tank continuously in described device the general throughput direction of handled waste material.

Heat treatment is subject to coming from stove and directed (mainly with adverse current towards waste material) by the impact of the flue gas of described device.Heat transmission is mainly by convection current.

Although conveyer belt (conveyors, conveyer) is typically for waste material is carried by described device, and in order to transport waste material in described passage preferably oscillatory type and/or swing type conveyer belt, transfer member can be any type.They are generally aimed at horizontal mode more or less, but also can be embodied as the layout of inclination.This is not only suitable for respect to effective feed surface (it equals that part being covered by waste material of transfer member) of this transfer member, and is also suitable for for the general layout of this transfer member.

Preheating of waste material is important, to reduce in the waste material in the time being fed in melt container and the temperature difference between the fused mass in this container Already in.

According to the device of prior art shortcoming be, only be transported to waste material upper strata on described conveyer belt preheated to sizable degree, and any material (waste material of the lower floor especially contacting more or less with conveyer belt) under this upper strata is not preheated in great majority application fully.About nethermost waste material layer, cooling even with to preheat aspect inconsistent by water and/or air to conveyer belt.

This result is to have large thermal stratification in the waste material in the various layers that are arranged on conveyer belt.In the device of prior art, the gross thickness of all layers of the waste material on conveyer belt is about 800mm, scope is from 600mm to 1000mm, and the width of conveyer belt typically in the scope of 1.50m to 2.5m to match with the charging opening of the intermediate bin being associated or metallurgical tank respectively.

US5,400,358A further discloses at the material delivery end place that preheats chamber safety burner is provided, but the installation of these burners causes further problem:

This type of burner provides the thermal treatment zone of point-like flame and point-like degree as atomizer burner, caused the non-uniform heat flux of waste material.They also can cause in the waste material layer of top that the formation of melting phase, this melting may penetrate in the lower zone (layer) of waste material and/or arrives on conveyer belt, thereby solidify and cause extra technical problem in uncontrollable mode.

The object of this invention is to provide a kind of device of mentioned type, it can cause more effectively preheating of waste material.

This object is by a kind of device, this device has bottom, sidewall and top, and transfer member, bottom, sidewall limits passage together with top, described transfer member extends to the outlet port of described passage on the axial direction of passage from the ingress port of passage, for metallurgical material is transferred to described outlet port from described ingress port, wherein, at least one heating element heater based on radiant energy so that the mode that the radiant heat being discharged by described heating element heater is directed on described transfer member towards metallurgical material be arranged between described ingress port and described outlet port.

The selection of the heating element heater based on radiation of similar radiant burner is the fact based on such: the heat transfer mechanism of this type of pharoid is mainly based on radiation rather than flame.

As the first result, any hot spot has been avoided in the use of this type of radiating element, and can not cause thermal diffusion, and therefore makes waste material heating more even.

The second, hot " time of staying " being provided by the described heating element heater based on radiation is longer than the time of staying that is inhaled into the flue gas by transfer passage.

Known suction system is typically with the velocity of flue gas running of 20m/s to 40m/s, thereby in view of the typical channel length of 20m to 40m, the time of staying of flue gas in passage is restricted to approximately 1 second.At present, improve the heat transmission to waste material by pharoid, because pharoid and velocity of flue gas independently turn round.

This system for continued operation and so-called fixing heater are correct.。

In the middle of having avoided any between heating element heater and waste material to be heated, installed part is when making radiant heat directly to arrive waste material, and the validity of described radiating element is increased.

Selection be among described device (tunnel) or under one or more heating element heaters are installed.Although preferably should be arranged on the outside of this passage for the corresponding input pipe of fuel, gas etc., effective radiating surface of this heating element heater preferably can all obtain in passage, and preferably just with treat that heated waste material is relative.According to an embodiment, pharoid is arranged in movably on support, and its active surface (this active surface emitted radiation) can be adjusted individually.By the distance reducing between larger radiating surface and/or heater and waste material, increase hot transmission.

This heating element heater can be bat wing radiator, and it has quite large-sized radiation active surface, the radiation active surface of for example have >=0.5 ㎡.

In principle, this new technology allows only by the pharoid of a suitable dimension, waste material to be preheated.

Selection be the structure whole top of this device or at least some parts at described top as pharoid, but typically, in the each region that preheats chamber, be spaced from each other a distance multiple heat radiation heater/burners be installed.

One or more heating element heaters should preferably be arranged along the Part I of the passage starting from ingress port (entrance opening), wherein said part can extending at least or on maximum 1/5,1/4 or 1/3 at the total length of described passage,, in such part of described passage, extend,, at this part place, the temperature difference between heating element heater and waste material is typically than higher in the part near outlet port and the close metallurgical tank being associated of described chamber.

Factory is separately depended in quantity, size and the design of described pharoid.Typically more or less equal to be transported under the surperficial condition of the waste material layer on feed surface at the feed surface of induction system (transfer member), total effectively radiating surface of described one or more heating element heaters can be more than or equal to described transfer member along 10% of total feed surface of the corresponding axial length of described passage.This relation can be increased to >=20%, >=30%, >=40% or >=50%, to increase the heat transmission to waste material.

Although heating element heater can be arranged in any position of this passage, preferably above transfer member, heating element heater is installed in a distance.

According to DE102000904775A1, heating element heater can be ceramic radiation burner, for example, and so-called porous burner device module and/or radiant burner.

The use of these radiant burners has reduced energy requirement, and has reduced discharge simultaneously.These heating element heaters can be lighted by fossil fuel, but pharoid also can be activated by electric energy.

According to an embodiment, the position that is different from burner position be collected and be transferred to any flue gas being produced by radiant burner/heating element heater can via corresponding conduit, in this position, these flue gases can be used as heated air and are fed in passage, this heated air and then be directed on waste material layer or be directed in waste material layer, further to increase waste material temperature before being fed in stove at waste material.

Overall idea is in this respect to provide at least one conduit, described at least one conduit has at least one ingress port and at least one outlet port, this at least one ingress port is associated with the discharge unit of at least one heating element heater, this at least one outlet port enters in (passing into) passage, can is supplied to and get back in passage as heated air by this at least one conduit from the exhaust of described at least one heating element heater.

Although the ingress port of this conduit (pipeline) can be arranged in that part of the device that is equipped with radiant burner, for example ingress port can be arranged in the passage that starts at ingress port place first in 1/3rd, but outlet port can enter this passage along 1/3rd or the 3rd 1/3rd of second of passage, in above every kind of situation, all on the axial direction of passage, watch.

As above, with respect to as described in prior art, a rear technology can be combined with the traditional heating of the flue gas by from stove.

Another optional feature provides with adjustable way heating element heater has been arranged in described passage, to transmit according to the design optimization heat of corresponding waste material layer.

In this respect, the present invention includes an embodiment, according to this embodiment, transfer member is larger than the width of close outlet port near the width of ingress port.This means sizable difference of width, rather than manufacturing tolerance.

Transfer member can be conveyer belt member, for example, swing type conveyer belt, it is equipped with horizontal horn-like portion (flares) alternatively, wherein has the larger height perpendicular to transportation horizontal along the horn-like portion of that part with less width of transfer member than the horn-like portion of that part with larger width along transfer member.

Because the gross mass of waste material should be retained to along its path by preheating apparatus and look younger etc. (compared with prior-art devices) and constant, so it is evident that, wider conveyer belt system allows to reduce the thickness of total waste material layer.

Although prior art induction system has the conveyer belt width of 1.50m to 2.5m and total waste material layer thickness of about 60cm to 100cm conventionally, but the width of this transfer member is increased at least 3.0m+/-0.5m by new system, be that width (this width is perpendicular to the throughput direction of waste material) is doubled approx, make under waste material quality keeps constant condition more or less, the thickness of waste material layer can be reduced approximately 50%.Can be >=3.5m of this width, for example >=4.0m.

Via the what is called charging window in stove, by this stove of dress, wherein window has limited size to waste material.

At present, the width that again reduces transfer member before in packing waste material into stove becomes necessary, or in other words: conveyer belt or the charging apparatus being associated should adapt to stove size.

In this respect, the present invention has been proposed, so as before waste material separating device or after waste material separating device soon (before, in packing waste material into stove in any case) reduce the width of transfer member.At present, term " near outlet port " comprises such embodiment, that is, according to this embodiment, the size reduction of transfer member is outside realization of passage of described device.

According to one embodiment of present invention, the width of transfer member reduces (reducing 10% to 90%) along the passage between ingress port and outlet port with 10% to 90% coefficient.In typical application, this scope can be between 20% to 80% or between 40% to 60%.According to an optional embodiment, on the axial direction of passage, to watch, the width of transfer member is realized this along last 1/3rd of the passage starting at ingress port place and is reduced, for example, before the outlet port of passage, realize soon this soon or afterwards and reduce.

The width of transfer member can stepwise or in a continuous manner reduce.Any end difference is arranged to completely or partially perpendicular to the throughput direction of waste material and/or is for example arranged to completely or partially, with respect to the longitudinal axis of device angled (, become 10 degree to the angle of 80 degree or become 20 degree to the angle of 70 degree and/or have the surface of inclination).In top view, this end difference can have trapezoidal (irregular quadrilateral) or polygonal shape.

Preheat although stronger also and can realize by the longer time of repose in passage by waste material, compared with growth device so that become necessary or charging must minimizing, both are less desirable.

Carry out contrast test, to investigate the Temperature Distribution in different waste material layers carried out heat treatment and conveying along certain distance after.

Experimental series A relates to by the prior art of the flue gas from electric arc furnaces (1400 ℃) and heat-treating, and wherein said flue gas is introduced in the outlet port of preheating apparatus and is conducted through passage with convection current and arrives waste material.Waste material is carried with the layer of 80cm height on the water cooling conveyer belt of 1.5m width.The total length of this device/passage between entrance and outlet is 30m.

By the use of preheating apparatus, experimental series B is different from A, and wherein conveyer belt has the width of 3m, and waste material layer has the thickness/height of 40cm.

Record following temperature (℃):

?	Test A	Test B
			At ingress port place and at scraped surface place	30	30
5m and at scraped surface place after ingress port	260	280
			After ingress port 5m and under scraped surface 15cm	50	75
10m and in surface after ingress port	410	450
			After ingress port 10m and under scraped surface 25cm	70	80

20m and at scraped surface place after ingress port	690	780
			After ingress port 20m and under scraped surface 10cm	350	470
After ingress port 20m and under scraped surface 30cm	70	80

Be apparent that, in the time that waste material layer is thinner, preheats and improved significantly.The waste material layer of 20cm to 50cm thickness brings good result to the chamber of preheating of normal length (25m-40m, great majority are about 25m-35m).

Due to intensive contact the between radiant heat and waste material, heat passes through radiation heating and is further improved.

The efficiency of heating surface can be by following and further increased: at waste material by mixing waste in the path process of preheating apparatus, making to be arranged in to descend most waste material sheet in waste material layer and that closely contact thus (water) cooling conveyer belt in the porch of this device has an opportunity to move up, and arrive the top of total waste material layer, or at least the position of more close waste material upper surface is before compared in arrival, and/or directed and differently contact flue gas and/or radiant heat with another, described flue gas is inhaled into or blows and passes through passage, described radiant heat comes from the corresponding pharoid/burner in that part of this device.

This rotation of waste material sheet or torsion can realize by different structure designs.Design is to provide a transfer member with at least one end difference, makes waste material sheet be prompted to drop to lower transportation horizontal along described end difference.This end difference has reduced the transportation horizontal of this transfer member.For mentioned application, can have >=20cm of this end difference, >=30cm, >=40cm or >=the vertical height of 50cm.

According to another embodiment of the present invention, at least one structure member is provided, and it is for the position along be transported at least a portion of the metallurgical material on described transfer member by the path changing of the passage between described ingress port and described outlet port.

Another kind of design is the mechanical erection part of the transport path based on along waste material.This mechanical organ stretches in the transport path of waste material, impels that the waste material sheet of the contact of installed part therewith rotates, tilts, topples over etc.This mechanical organ can be arranged statically or movably.

Avoid or reduced the danger that produces melting phase in waste material preheating in process the mixing to waste material, and before simultaneously in packing waste material into stove, having increased the mean temperature of waste material.

Further feature of the present invention is open in dependent claims and other application documents (description to a specific embodiment below comprising).

Unless those combinations that are excluded, if helpful technically, even by open particularly, according to indivedual features of the present invention also can with other Feature Combinations.

Accompanying drawing schematically shows in following figure:

Fig. 1 a: according to the view on the transfer member from the auto levelizer of top of the present invention

Fig. 1 b: the vertical section figure of the device of Fig. 1 a

Shown device 10 is for waste material being preheated to (representing with various shapes and label S in Fig. 1 b) before being loaded into electric arc furnaces E at waste material S.

This device comprises bottom 12, sidewall 14 and top 16, and described bottom, sidewall and top form the tunnel with passage 18 together with all, this tunnel on longitudinal direction L-L at ingress port 20(entrance) with outlet port 22(outlet) between extension.Conveyer belt 24 extends through described passage 18 on described longitudinal direction L-L.Conveyer belt 24 is by air cooling from below (cooling jet is to be represented by label 24k).

As seen from Fig. 1 a, Fig. 1 b, conveyer belt 24 comprises different sections.The section 24-1 starting at ingress port 20 places has the width of 3m, and the inner width of passage 18 is slightly larger.Section 24-1 the certain level (L1) on surface (24s) that is defined for pending waste material S locate to extend reach transport conveyer belt total length approximately 2/3.

In section 24-1, the structure member that is designed to bar 34 is installed, described bar 34 is fixed on 16 places, top and stretches in waste material layer, to impel waste material sheet to tilt, also change thus the position of waste material sheet and the different surfaces region towards heating element heater 28 is provided.

The second conveyer belt section 24-2 follows after section 24-1 on the longitudinal direction L-L of the outlet 22 towards described device, locates, thereby form and mix the M of end difference portion between section 24-1 and the second conveyer belt section but the second conveyer belt section is positioned at lower level (L2).

This end difference M is transverse to the longitudinal axes L-L of this device, but also can provide angled section (being represented by dotted lines) to increase above-mentioned mixed effect.

The waste material S section of dropping to 24-2 on the section of being transported to 24-1 is upper, thereby has changed its orientation and therefore presented another surf zone towards the top 16 of described device.Waste material sheet S in different layers (perpendicular to the different layers on conveyer belt surface) can their position of exchange, this end difference place.

In addition, other this type of end difference can be installed or for changing other members of position of each waste material sheet in described device 10.

Section 24-2 has three subsegments, that is, the section 24-2a(section of being similar to 24-1), follow the section 24-2b section 24-2a after and follow after section 24-2b and be continued until section 24-2c of the outlet portal 22 of passage 18.

As seen best in Fig. 1 a, conveyer belt width starts, reduces and finish with the subsegment 24-2c with same widths in section 24-2b with the section 24-1 with same widths, and subsegment 24-2c is about 1.5m or the half for section 24-1 width.

Although waste material S about 30cm height compared with substratum (only being represented by one deck waste material sheet than section 24-2) in along section 24-1 conveying, but the restriction sidewall of conveyer belt 24 is higher in subsegment 24-2b and subsegment 24-2c, because the transitional region place between the present subsegment 24-2b of the waste material of equal in quality and subsegment 24-2c is disposed in the thicker layer of about 60cm.

Waste material S as following along its by as described in the path of device be heated: the first half (from entrances 20 towards exporting 22) of passage 18, porous ceramics radiant burner 28 be installed under top 16 and be positioned at apart from waste material S compared with short distance, wherein each porous ceramics radiant burner 28 has about 1m ²effective ceramic radiation surface.This arranges and allows very effective heat to transmit.Radiant burner 28 utilizes gas combustion.

Waste gas is discharged from the rear side 38a of these heating element heaters (radiant burner 28), and be supplied to different outlet ports via the ingress port 30a of conduit 30, described different outlet port is designed to nozzle 32a, 32b, and described nozzle is arranged in the sidewall 14 of this device and is positioned at conveyer belt 20 tops, and is slightly positioned on waste material (layer).According to Fig. 2 b, in transitional region between nozzle 32a, the 32b section of being arranged on 24-2a and section 24-2b and before being disposed immediately in the transitional region between subsegment 24-2b and subsegment 24-2c, described nozzle is used for the waste gas (flue gas) of autoradiolysis burner 28 in the future and is recycled to passage 18, to support preheating of waste material S.

This device 10 with its new feature described above.With reference to the describe, in general terms part of this description.

Claims (15)

1. a device (10), there is bottom (12), sidewall (14) and top (16), and transfer member (24), described bottom, described sidewall limits passage (18) together with described top, described transfer member extends to the outlet port (22) of described passage (18) on the axial direction of described passage (18) from the ingress port (20) of described passage (18), for metallurgical material (S) is transferred to described outlet port (22) from described ingress port (20), wherein, at least one heating element heater (28) based on radiant energy is arranged between described ingress port (20) and described outlet port (22) by this way, described mode is for making the radiant heat being discharged by described heating element heater (28) be directed on described transfer member (24) towards described metallurgical material (S).

2. device according to claim 1, between heating element heater (28) and metallurgical material (S) without any middle installed part.

3. device according to claim 1, wherein, described at least one heating element heater (28) be arranged among the described top (16) of described device (10) or under.

4. device according to claim 1, wherein, described at least one heating element heater (28) is designed to bat wing radiator.

5. device according to claim 4, wherein, the radiation active surface of described bat wing radiator is>=0.5m ².

6. device according to claim 1, wherein, first 1/3rd layout of the described passage starting is located on described at least one heating element heater (28) edge on the axial direction of described passage (18) at described ingress port (20).

7. device according to claim 1, wherein, total effectively radiating surface of described at least one heating element heater (28) be more than or equal to the corresponding axial length along described passage (18) of corresponding transfer member (24) total feed surface 20%.

8. device according to claim 1, wherein, multiple heating element heaters (28) are distributed on a distance of described transfer member (24) top.

9. device according to claim 1, wherein, described at least one heating element heater (28) is ceramic radiation burner.

10. device according to claim 1, at least one conduit (30) has at least one ingress port (30a) and at least one outlet port (32a, 32b), described at least one ingress port is positioned at the discharge unit (28a) of described at least one heating element heater (28) and locates, described at least one outlet port enters in described passage (18), can is supplied to and get back in described passage (18) as heated air by described at least one conduit from the exhaust of described at least one heating element heater (28).

11. devices according to claim 1, wherein, described ingress port (30a) be arranged in locate at described ingress port (20) the described passage (18) that starts first in 1/3rd, and described outlet port (32a, 32b) enters described passage (18) along second 1/3rd or the 3rd 1/3rd of described passage (18), in every kind of above situation, all on the axial direction of described passage (18), watch.

12. devices according to claim 1, wherein, described at least one heating element heater (28) is lighted by fossil fuel or electric energy.

13. devices according to claim 1, wherein, described transfer member (24) is larger than the width near described outlet port (22) near the width of described ingress port (20).

14. devices according to claim 13, wherein, the width of described transfer member (24) reduces with 10% to 90% coefficient along the passage (18) being positioned between ingress port (20) and outlet port (22).

15. devices according to claim 1, comprise at least one structure member (34), described at least one structure member is used for changing the position along be transported at least a portion of the described metallurgical material (S) on described transfer member (24) by being positioned at the path of the passage (18) between described ingress port (20) and described outlet port (22).

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